Kristal Delvalle stabbed Norberto Cruz-Valentin to death in their Concourse Village home, police said.
The homicide took place at 1064 Carroll Pl. in the 44th Precinct.
Michelle Cox, 41, was killed inside her apartment on Webster Avenue near East 179th Street.
Murders and shootings are up 20 percent from last year, police officials said Monday.
Kevin Lopyan was found dead in his basement in Kew Gardens Hills on Feb. 14, police said.
Shemrod Isaac was shot four times and killed in the Lillian Wald Houses, police said.
Shemrod Isaac was shot about 4:30 p.m. Monday and was pronounced dead at the hospital, NYPD says.
Kevin Colon, 20, was shot at around noon on Thursday afternoon, police said.
Jose Antonio Cocuyo-Malaga had been drinking in a bodega when got into a fight outside, police said.
Eric Roman, who was shot in Queens Friday, died the next day.
Donte Saunders, 22, of The Bronx, was killed early Monday, police said.
The 108 Precinct recently tweeted sketches of the suspects in the killing of gay activist Lou Rispoli.
Arnell Jones was arrested for the murder of Eric Simmons whose body was found in January.
William Klinger was allegedly killed by Alexander Bonich over a real estate deal.
Shadale Graham was killed when two gunmen opened fire after an argument on Sunday evening, police said.
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